Cross seam joining device for joining a sealing seam for a flexible packaging

Abstract

The invention relates to a cross seam joining device for a flexible packaging having at least one ultrasonic applicator (13a-13c), which is rotatably mounted on a shaft (13d) and can be rotated about an axis (13e) of the shaft (13d) arranged longitudinally to the cross seam (110, 111). The ultrasonic applicator (13a-13c) is designed to produce and bundle ultrasounds in a frequency range of 0.1 MHz-0.5 MHz, preferably from 0.5 MHz-2 MHz.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to a device for joining a cross seam of a flexible packaging and particularly to a device for joining a cross seam of a tubular bag packaging by means of an ultrasonic applicator.[0002]Devices are already known, in which join connections on packagings are produced on horizontal and vertical tubular bag machines by means of conventional ultrasound in the range of 20 to 40 kHz.[0003]After shaping the packaging material on the forming shoulder, the film is joined to form a packaging material tube by means of the longitudinal seam. After the product has been fed into the tubular bags, the cross seams are sealed; the product feed can, however, also take place when the tube is being formed. The packaging material tube is subsequently separated into individual tubular bags by means of a cutting function.[0004]In the known devices, conventional ultrasonic systems consist of a converter, an optional booster and a sonotrode. The v...

AI Technical Summary

Benefits of technology

The invention is about a rotary ultrasonic applicator for joining materials together. The applicator includes an ultrasonic transducer, a focusing assembly, and a sound conductor which work together to precisely introduce ultrasonic energy into the joining area. The applicator can be mounted on a carrier connected to a shaft, which allows for effective precise joining seams. The blade is integrated into the counter holder or disposed adjacent to it, making the device compact and easy to maintain. The ultrasonic transducer is shaped like a plate, simplifying production and reducing costs. The counter holder is made from ceramic material which provides favorable frictional characteristics and resistance to wear. Overall, the technical effects of the invention include improved precision and efficiency in joining materials together.

Problems solved by technology

Although the operating frequency of the conventional ultrasound lies above the frequency range which can be perceived by humans, the noise emissions are problematic due to the vibrational response of the overall structure or the stimulation of subharmonics and can lead to irreparable damage to hearing if ear protection is not used.

This represents a potential danger spot for the user because an immediate stoppage of the vibrating system does not occur, even in the case of an emergency shutdown.

This embodiment requires an extremely high manufacturing effort and manufacturing time because the resonance frequency has to be checked time and again in certain manufacturing steps until final completion.

This very complex manufacturing process is extremely cost intensive.

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